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Melia says we are strong as fuck and should be able to win easily anyway. Well, thanks.
Water gym leader then decides to fight where she can have a bullshit advantage to make it harder for us. Thanks. She'll bring you to an island off the shore.
It has a very high chance of raining there, too, because the bullshit field isn't already enough of an advantage. Keep reloading the area until it's not raining anymore.